<!-- eslint-disable vue/multi-word-component-names -->
<template>

    <div class="login_container">
        <div class="login_box">
            <!-- 头像 -->
            <div class="avator_box">
                <img src="../assets/logo.png" alt="">
            </div>

            <!-- 登录表单 -->
            <el-form ref="loginFormRef" :model="loginForm" :rules="loginFormRules" label-width="0px" class="login_form">

                <el-form-item prop="username">
                    <el-input v-model="loginForm.username" class="w-50 m-2" placeholder="请输入用户名" >
                    <template #prefix>
                    <el-icon class="iconfont icon-user"><search /></el-icon>
                    </template>
                    </el-input>
                </el-form-item>

                <el-form-item prop="password">
                    <el-input v-model="loginForm.password" class="w-50 m-2" type="password" placeholder="请输入密码">
                    <template #prefix>
                    <el-icon class="iconfont icon-3702mima"><search /></el-icon>
                    </template>
                    </el-input>
                </el-form-item>

                <el-form class="btns">
                    <el-button type="primary" @click="login">登录</el-button>
                    <el-button type="info" @click="resetLoginForm">重置</el-button>
                </el-form>
            </el-form>

        </div>
    </div>
</template>

<script>

export default {
    data() {
        return {
            loginForm:{
            username: 'admin',
            password: '123456'
        },

        // 验证登录信息是否合法
        loginFormRules: {
            username: [
                // required 必填项  trigger 触发时机(文本框失去焦点触发)
                { required: true, message: '请输入登录名称', trigger: 'blur' },
                { min: 3, max: 10, message: '长度在3到10个字符', trigger: 'blur' }
            ],
            password: [
                { required: true, message: '请输入登录密码', trigger: 'blur' },
                { min: 6, max: 20, message: '长度在6到20个字符', trigger: 'blur' }
            ]
            }
        }
    },  
    methods: {
        // 重置表单事件
        resetLoginForm() {
            this.$refs.loginFormRef.resetFields();
        },
        login() {
            this.$refs.loginFormRef.validate(async vaild => {
                if (!vaild) return;
                // await 简化 发送promise  必须用在异步模块中 async
                // 需要开启数据库， node .\app.js
                const { data: res } = await this.$http.post("login", this.loginForm);
                if (res.meta.status !== 200) return this.$message.error('登陆失败');
                this.$message.success('登陆成功');
                // 1.登录成功后的token，保存在客户端的sessionStorage中
                //  1.1 项目中除了登录外的API接口，必须登录后才能访问
                //  1.2 token 只应该在当前网站打开期间生效， 所以将token 保存在se...中

                window.sessionStorage.setItem('token', res.data.token);
                // 2.通过编程式导航跳转到后台主页，路由地址 /home
                this.$router.push("/home");


            })
        }
    }
}
</script>

<style lang="less" scoped>
.login_container{
    background-color: #2b4b6b;
    height: 100%;
}

.login_box{
    width: 450px;
    height: 300px;
    background-color: #fff;
    border-radius: 3px;
    position: absolute;
    left: 50%;
    top:50%;
    transform: translate(-50%, -50%);

    .avator_box{
        height: 130px;
        width: 130px;
        border: 1px solid #eee;
        border-radius: 50%;
        padding: 10px;
        box-shadow: 0 0 10px #ddd;
        position: absolute;
        left: 50%;
        transform: translate(-50%, -50%);
        background-color: #fff;
        img{
            width: 100%;
            height: 100%;
            border-radius: 50%;
            background-color: #eee;
        }
    }

    .login_form{
        position: absolute;
        bottom: 0;
        width: 100%;
        padding: 0 20px;
        box-sizing: border-box;
    }
    .btns{
        display: flex;
        justify-content: flex-end;
        padding-bottom: 10px;
    }
}
</style>
